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Fluidized bed reactor and method for synthesizing methyl chlorosilane by using same

A fluidized bed reactor and fluidized bed technology, applied in chemical instruments and methods, compounds of group 4/14 elements of the periodic table, organic chemistry, etc., can solve the problem of reducing the effective cross-sectional area of ​​the bed and blowing out the catalyst from the bed , affect the reaction process and other issues, to achieve the effect of prolonging the synthesis production cycle, improving the macroscopic reaction speed, and increasing the particle concentration

Active Publication Date: 2009-09-23
ZHENJIANG JIANGNAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a large fluidized bed with a large heat of reaction, there are dozens or even hundreds of heat exchange tubes, and the addition of heat transfer tube bundles will significantly reduce the effective cross-sectional area of ​​the bed for a straight cylindrical fluidized bed, resulting in an empty tower. The gas velocity is too high, so that the particles with small particle size are easy to be blown out, especially for the production process of organosilicon monomer, the particle size of the catalyst is very small, it is easy to make the catalyst be blown out of the bed, thus affecting the reaction process

Method used

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  • Fluidized bed reactor and method for synthesizing methyl chlorosilane by using same
  • Fluidized bed reactor and method for synthesizing methyl chlorosilane by using same
  • Fluidized bed reactor and method for synthesizing methyl chlorosilane by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] fluidized bed reactor

[0023] Such as figure 1 and figure 2 , the fluidized bed reactor includes a cylinder body 9, an enlarged section cylinder body 3, an upper cone body 5, a distribution plate 15 installed at the bottom of the fluidized bed, an inlet pipe 12 below the distribution plate, that is, a feed gas inlet, and inside the cylinder body The finger-shaped casing bundle 10, the feeding port 8, the slag discharge port 13 at the bottom, the upper head 2, and the lower head 14. The flow guide device is installed in the middle of the distribution plate 15 and the finger-shaped casing bundle 10. The lower end of the flow guide device is connected to the The top of the distribution plate 15 is connected, and its upper end is connected with the cylinder of the fluidized bed. The flow guide device includes a gas distribution pipe 18, a flow guide pipe 17 and a gas distribution flange 19. The gas distribution pipe 18 is composed of at least two bends. The lower end of...

Embodiment 2

[0025] Synthesis of Methylchlorosilane

[0026] As in the fluidized bed reactor of Example 1, there are 20 guide tubes, the angle between the guide tube 17 and the flange of the distribution plate is 30°, the length of the guide tube is 50 mm, and the pipe diameter DN is 20 mm. The diameter DN is 100mm. Adjust 35% of the total weight of the raw material gas methyl chloride to enter from the gas inlet 12 at the bottom of the fluidized bed, and the gas flow rate is 0.4m / s to form an axially flowing air flow, and the remaining 65% of the methyl chloride gas is fed into the gas inlet 11, The gas flow rate is 30m / s, so that the gas flow adds a tangential velocity on the basis of the original axial velocity. When the temperature is 280°C, the raw silicon powder particles, copper catalyst and co-catalyst are added from the fluidized bed raw material feeding port 8, As a result, the solid particles entrained in the raw material gas rise in a spiral shape, and the contact time between...

Embodiment 3

[0029] Synthesis of Methylchlorosilane

[0030] As in the fluidized bed of Example 1, a baffle layer 4 is installed in the fluidized bed, and the baffle layer is installed in the upper cone 5 of the cylinder body, and the height of the baffle layer is 30% of the height of the upper cone. The diversion device is installed in the middle of the distribution plate and the finger-shaped sleeve bundle. There are 36 diversion pipes. The angle between the diversion pipe and the flange of the distribution plate is 10°. The length of the diversion pipe is 50mm, and the diameter DN is 20mm. The pipe diameter DN is 150mm. Adjust 50% of the methyl chloride gas to enter from the gas inlet 12 at the bottom of the fluidized bed, and the gas flow rate is 0.35m / s to form an axially flowing air flow, and the remaining 50% of the methyl chloride gas is fed through the gas inlet 11, and the gas flow rate is 20m / s, so that the air flow adds a tangential velocity on the basis of the original axial...

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Abstract

The invention relates to the field of environmental protection and chemical industry, in particular to a fluidized bed reactor. In the invention, a gas guiding device is additionally arranged between a distribution plate at the bottom of the fluidized bed reactor and a cylinder. The guiding device comprises a gas distribution pipe, a guiding pipe and a gas distribution flange. The gas distribution pipe comprises at least two sections of elbow pipes, the lower end of each elbow pipe is connected with the guiding pipe, the middle part at the outer end of each section of elbow pipe is connected with a gas inlet, and the other end of the guiding pipe is connected with the gas distribution flange. After the guiding device is additionally arranged, part of material gas can be shunted and tangentially enters a fluidized bed. Tangential gas inlet enables gas in the fluidized bed to be added with tangential speed on the basis of the prior upward axial speed, and gas and carried raw material particles spirally ascends to form a rotational flow field to enable contact time of reaction materials to be prolonged. The invention also relates to a method for synthesizing methyl chlorosilane by using the reactor.

Description

technical field [0001] The invention relates to the fields of environmental protection and chemical industry, in particular to a fluidized bed reactor, and also relates to a method for synthesizing methylchlorosilane by using the fluidized bed reactor. Background technique [0002] Methylchlorosilane is usually synthesized by the Rochow direct method. The solid raw material in the synthesis reaction is silicon powder particles, the catalyst is copper powder particles, methyl chloride and the gaseous reaction product act as a fluidizing medium, and the reaction process is gas-solid-solid reaction. Unreacted methyl chloride, gaseous methylchlorosilane, gaseous by-products, catalyst components and fine dust leave the reactor. The full contact of silicon powder and copper powder and the effective removal of reaction heat have an important impact on the reaction, so continuous fluidized bed reactors are used in industry to realize the production of methylchlorosilane. In order ...

Claims

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Application Information

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IPC IPC(8): B01J8/24C07F7/16
Inventor 朱德洪阎世城杨捷宫有圣钱芬芬刘衍兵张友林朱恩俊
Owner ZHENJIANG JIANGNAN CHEM
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